一种基于混合域的彩色图像盲水印算法

A Blind Watermark Algorithm in Color Image Based on Mixed Transform Domain

采用混沌序列加密并定位,提出了一种基于混合域的二值水印嵌入方法,也可用于归一化灰度水印的嵌入.该方法将图像分解为R,G,B三个分量,分别对每个分量进行离散小波变换,在小波变换的低频区进行离散余弦变换,在离散余弦变换域中利用混沌序列对水印信息嵌入位置定位,水印信息的嵌入采用频率系数比较的方法.实验结果表明,该算法在满足水印透明性的同时,水印信息在噪声干扰、图像处理、人为恶意攻击及图像压缩条件下具有很好的鲁棒性.应用混沌序列,在完成水印信息定位的同时增强了算法的安全性.

Using chaotic sequence for encryption and location is proposed, an algorithm in color image, which embeds binary watermark in mixed transform domain and adapts to gray watermark dividing the color image into RGB values. Discrete wavelets transform is adopted in every value and discrete cosine transform in low-frequency discrete wavelet transform（DWT） areas. Chaotic sequence are used to locate the watermark information in discrete cosine transform （DCT） domain. The watermark information is embedded by the comparison of frequency coefficients. The experimental results showed that the algorithm has a good robustness against noise, image processing, malicious attacks, and image compression. It enhances the security capability.